fix: remove leading space from @@ -503 @@ hunk header in scylla 4.19.0.8 and 4.19.0.9 patches

git apply requires hunk headers (@@...@@) to start at column 0.
A leading space caused git apply to treat the header as a context
line, breaking the parse of the subsequent hunk and triggering:
  'patch fragment without header at line N: @@ -643,6 ...'

Also correct the +c offset: after inserting the release:-fix hunk
(net +2 lines), the result-file line number for @@ -503 @@ is
503 + 3 (prior hunks) + 2 (release: fix) = 508, not 509/506.

Author: nikagra

versions/scylla/4.19.0.8/patch

@@ -540,7 +540,7 @@ index e7b2b4e4a..a4b2ecea7 100644
      }
      // for 4.0 or 5.0 pre-releases, the CCM version string needs to be "4.0-alpha1", "4.0-alpha2" or
      // "5.0-beta1" Version.toString() always adds a patch value, even if it's not specified when
- @@ -503,7 +506,18 @@ public class CcmBridge implements AutoCloseable {
+@@ -503,7 +508,18 @@ public class CcmBridge implements AutoCloseable {
    }
 
    public void addWithoutStart(int n, String dc) {

versions/scylla/4.19.0.9/patch

@@ -218,7 +218,7 @@ index e7b2b4e4a0..8fbbed8d95 100644
      }
      // for 4.0 or 5.0 pre-releases, the CCM version string needs to be "4.0-alpha1", "4.0-alpha2" or
      // "5.0-beta1" Version.toString() always adds a patch value, even if it's not specified when
- @@ -503,7 +509,18 @@ public class CcmBridge implements AutoCloseable {
+@@ -503,7 +508,18 @@ public class CcmBridge implements AutoCloseable {
    }
 
    public void addWithoutStart(int n, String dc) {